|author||NeilBrown <email@example.com>||2006-04-10 22:52:48 -0700|
|committer||Linus Torvalds <firstname.lastname@example.org>||2006-04-11 06:18:30 -0700|
[PATCH] md: make sure 64bit fields in version-1 metadata are 64-bit aligned
reshape_position is a 64bit field that was not 64bit aligned. So swap with new_level. NOTE: this is a user-visible change. However: - The bad code has not appeared in a released kernel - This code is still marked 'experimental' - This only affects version-1 superblock, which are not in wide use - These field are only used (rather than simply reported) by user-space tools in extemely rare circumstances : after a reshape crashes in the first second of the reshape process. So I believe that, at this stage, the change is safe. Especially if people heed the 'help' message on use mdadm-2.4.1. Signed-off-by: Neil Brown <email@example.com> Signed-off-by: Andrew Morton <firstname.lastname@example.org> Signed-off-by: Linus Torvalds <email@example.com>
Diffstat (limited to 'drivers/md/Kconfig')
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index fd2aae150ccc..ac25a48362ac 100644
@@ -139,11 +139,12 @@ config MD_RAID5_RESHAPE
is online. However it is still EXPERIMENTAL code. It should
work, but please be sure that you have backups.
- You will need a version of mdadm newer than 2.3.1. During the
- early stage of reshape there is a critical section where live data
- is being over-written. A crash during this time needs extra care
- for recovery. The newer mdadm takes a copy of the data in the
- critical section and will restore it, if necessary, after a crash.
+ You will need mdadm verion 2.4.1 or later to use this
+ feature safely. During the early stage of reshape there is
+ a critical section where live data is being over-written. A
+ crash during this time needs extra care for recovery. The
+ newer mdadm takes a copy of the data in the critical section
+ and will restore it, if necessary, after a crash.
The mdadm usage is e.g.
mdadm --grow /dev/md1 --raid-disks=6